/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.script.faenor;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Logger;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

import javax.script.ScriptContext;
import javax.script.ScriptException;

import net.sf.l2j.Config;
import net.sf.l2j.gameserver.script.Parser;
import net.sf.l2j.gameserver.script.ParserNotCreatedException;
import net.sf.l2j.gameserver.script.ScriptDocument;
import net.sf.l2j.gameserver.script.ScriptEngine;
import net.sf.l2j.gameserver.script.ScriptPackage;
import net.sf.l2j.gameserver.scripting.L2ScriptEngineManager;

import org.w3c.dom.Node;

/**
 * @author Luis Arias
 */
public class FaenorScriptEngine extends ScriptEngine {
	static Logger _log = Logger.getLogger(FaenorScriptEngine.class.getName());
	public final static String PACKAGE_DIRECTORY = "data/faenor/";
	public final static boolean DEBUG = true;
	private static FaenorScriptEngine _instance;
	private LinkedList<ScriptDocument> _scripts;

	public static FaenorScriptEngine getInstance() {
		if (_instance == null)
			_instance = new FaenorScriptEngine();
		return _instance;
	}

	private FaenorScriptEngine() {
		_scripts = new LinkedList<ScriptDocument>();
		loadPackages();
		parsePackages();
	}

	public void reloadPackages() {
		_scripts = new LinkedList<ScriptDocument>();
		parsePackages();
	}

	private void loadPackages() {
		File packDirectory = new File(Config.DATAPACK_ROOT, PACKAGE_DIRECTORY);// _log.sss(packDirectory.getAbsolutePath());
		FileFilter fileFilter = new FileFilter() {
			public boolean accept(File file) {
				return file.getName().endsWith(".zip");
			}
		};
		File[] files = packDirectory.listFiles(fileFilter);
		if (files == null)
			return;
		ZipFile zipPack;
		for (File file : files) {
			try {
				zipPack = new ZipFile(file);
			} catch (ZipException e) {
				e.printStackTrace();
				continue;
			} catch (IOException e) {
				e.printStackTrace();
				continue;
			}
			ScriptPackage module = new ScriptPackage(zipPack);
			List<ScriptDocument> scrpts = module.getScriptFiles();
			for (ScriptDocument script : scrpts)
				_scripts.add(script);
		}
		/*
		 * for (ScriptDocument script : scripts) { _log.sss("Script: "+script);
		 * } _log.sss("Sorting"); orderScripts(); for (ScriptDocument script :
		 * scripts) { _log.sss("Script: "+script); }
		 */
	}

	public void orderScripts() {
		if (_scripts.size() > 1)
			// ScriptDocument npcInfo = null;
			for (int i = 0; i < _scripts.size();)
				if (_scripts.get(i).getName().contains("NpcStatData"))
					_scripts.addFirst(_scripts.remove(i));
				// scripts.set(i, scripts.get(0));
				// scripts.set(0, npcInfo);
				else
					i++;
	}

	public void parsePackages() {
		L2ScriptEngineManager sem = L2ScriptEngineManager.getInstance();
		ScriptContext context = sem.getScriptContext("beanshell");
		try {
			sem.eval("beanshell",
					"double log1p(double d) { return Math.log1p(d); }");
			sem.eval("beanshell",
					"double pow(double d, double p) { return Math.pow(d,p); }");
			for (ScriptDocument script : _scripts)
				parseScript(script, context);
		} catch (ScriptException e) {
			e.printStackTrace();
		}
	}

	public void parseScript(ScriptDocument script, ScriptContext context) {
		if (DEBUG)
			_log.fine("Parsing Script: " + script.getName());
		Node node = script.getDocument().getFirstChild();
		String parserClass = "faenor.Faenor" + node.getNodeName() + "Parser";
		Parser parser = null;
		try {
			parser = createParser(parserClass);
		} catch (ParserNotCreatedException e) {
			_log.warning("ERROR: No parser registered for Script: "
					+ parserClass);
			e.printStackTrace();
		}
		if (parser == null) {
			_log.warning("Unknown Script Type: " + script.getName());
			return;
		}
		try {
			parser.parseScript(node, context);
			_log.fine(script.getName() + "Script Sucessfullty Parsed.");
		} catch (Exception e) {
			e.printStackTrace();
			_log.warning("Script Parsing Failed.");
		}
	}

	@Override
	public String toString() {
		if (_scripts.isEmpty())
			return "No Packages Loaded.";
		String out = "Script Packages currently loaded:\n";
		for (ScriptDocument script : _scripts)
			out += script;
		return out;
	}
}
